Keystones — Capstone
Five GCSE retrieval questions · 8 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 9
Answer: 4(x - 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 72°. Give your answer to 2 decimal places
Answer: 189.74cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 15:24:20 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 16, 21, 28, 12, 74, 42, 98, 44. Give your answer to 2 decimal places
Answer: Mean = 47.33, Median = 42, Range = 86